1. Petals yellow to white (but sometimes drying pale lilac), usually with conspicuous dark veins, especially when fresh; mature fruit at most ca. 4 mm broad, strongly constricted between the seeds (often with 4 or 5 (-9) seeds) and strongly corky-ribbed over the seeds.

R. raphanistrum

1. Petals purple or sometimes white; mature fruit ca. 8-12 mm broad, not constricted or ribbed over the seeds, usually 2-3-seeded.

R. sativus